Pipe friction & head loss worksheet with answers

Free printable Pipe friction & head loss worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
V = 1.7 m/sD = 40 mmν = 1.31 × 10⁻⁶ m²/s

Water at 10 °C (ν = 1.31 × 10⁻⁶ m²/s) flows at a mean velocity of 1.7 m/s through a pipe with an inside diameter of 40 mm. Find the Reynolds number Re.

V = 1.7 m/sD = 40 mmν = 1.31 × 10⁻⁶ m²/s
Re =
2.Easy
V = 1.9 m/sD = 150 mmν = 1.14 × 10⁻⁶ m²/s

Water at 15 °C (ν = 1.14 × 10⁻⁶ m²/s) flows at a mean velocity of 1.9 m/s through a pipe with an inside diameter of 150 mm. Find the Reynolds number Re.

V = 1.9 m/sD = 150 mmν = 1.14 × 10⁻⁶ m²/s
Re =
3.Medium
V = 0.9 m/sD = 50 mmL = 50 mf = 0.02

Water flows at a mean velocity of 0.9 m/s through a pipe 50 m long with an inside diameter of 50 mm. Use the Darcy friction factor f = 0.02 and g = 9.81 m/s². Find the friction head loss hf.

V = 0.9 m/sL = 50 mD = 50 mmf = 0.02g = 9.81 m/s²
hf = m
4.Medium
V = 1.5 m/sD = 50 mmL = 150 mf = 0.03

Water flows at a mean velocity of 1.5 m/s through a pipe 150 m long with an inside diameter of 50 mm. Use the Darcy friction factor f = 0.03 and g = 9.81 m/s². Find the friction head loss hf.

V = 1.5 m/sL = 150 mD = 50 mmf = 0.03g = 9.81 m/s²
hf = m
5.Hard
K = 5free outletH = ?L = 100 m, D = 150 mm, f = 0.0184× bend (K = 0.3)

A pipe 100 m long with an inside diameter of 150 mm (Darcy friction factor f = 0.018) runs from an open reservoir and discharges as a free jet into the air. The minor losses are a square-edged entrance (K = 0.5), 4 bends (K = 0.3 each) and a valve (K = 5). Use g = 9.81 m/s². How far H must the reservoir surface be above the pipe outlet for a flow rate of 25 L/s?

Q = 25 L/sL = 100 mD = 150 mmf = 0.018Kentrance = 0.5Kbend = 0.3 (×4)Kvalve = 5
H = m
6.Hard
K = 10free outletH = ?L = 150 m, D = 300 mm, f = 0.0183× bend (K = 0.3)

A pipe 150 m long with an inside diameter of 300 mm (Darcy friction factor f = 0.018) runs from an open reservoir and discharges as a free jet into the air. The minor losses are a square-edged entrance (K = 0.5), 3 bends (K = 0.3 each) and a valve (K = 10). Use g = 9.81 m/s². How far H must the reservoir surface be above the pipe outlet for a flow rate of 150 L/s?

Q = 150 L/sL = 150 mD = 300 mmf = 0.018Kentrance = 0.5Kbend = 0.3 (×3)Kvalve = 10
H = m

Answer key

  1. 1. Re = 51908
  2. 2. Re = 250000
  3. 3. hf = 0.8257 m
  4. 4. hf = 10.32 m
  5. 5. H = 2.01 m
  6. 6. H = 4.912 m

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